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报道了一种聚合物边孔封装的无源光纤光栅水听器的研究结果。采用边孔封装结构对裸光纤光栅进行了增敏封装,其静态压力灵敏度提高了17120倍,为光纤光栅的水声探测奠定了物理基础;利用可调谐窄带光源的线宽窄和其波长可调谐的特点,采用带工作点控制的强度调制方案进行信号解调,不仅实现了高精度的动态信号检测,并解决了温度变化对系统影响的问题。实验测量结果表明,所设计的光纤光栅水听器在500Hz频率处的声压灵敏度为-153.3 dB(0 dB=1 pm/μPa),且具有非常好的各向同性指向性,其最小可测声压为61 dB(0 dB=1μPa/(Hz)~(1/2))。
This paper reports the results of a polymer edge-packed passive fiber grating hydrophone. The sensitivity of static pressure is improved by 17,120 times by using the side-hole package structure to enhance the sensitivity of the bare FBG. It provides the physical basis for the underwater acoustic detection of FBG. By using the tunable narrow-band light source with narrow linewidth and tunable wavelength The signal demodulation using the intensity modulation scheme with the working point control not only realizes high-precision dynamic signal detection but also solves the problem of the influence of temperature changes on the system. The experimental results show that the acoustic pressure sensitivity of the designed fiber grating hydrophone at the frequency of 500Hz is-153.3 dB (0 dB = 1 pm / μPa) and has very good isotropic directivity, the minimum measurable Sound pressure is 61 dB (0 dB = 1μPa / (Hz) ~ (1/2)).